Use the following steps to change the user account for an Instance.
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From the CommCell Browser, navigate to Client Computers > client >MySQL. 
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Right-click the instance,and then click Properties. The Properties of MySql Server dialog box appears. 
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To update the user account information, on the Accounts tab, complete one of the following steps: - 
For Windows, - 
To enter the SA User Name, click Change. Enter the MySQL user name and password. 
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To enter the NT UserName, click Change. Enter the Windows user name and password. 
 
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For Linux, - 
To enter the SA User Name, click Change. Enter the MySQL user name and password. 
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To enter the UNIX UserName, type the Linux user name. 
 
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Click OK.